But the touch-screen PCs, which can cost twice as much as typical machines, have been slow to catch on. H-P only sold about 400,000 of its TouchSmart desktops last year, compared with 54 million traditional desktops and laptops, estimates research firm IDC.

AllosphereAll science fiction movies have shown us that the future is in REALLY big displays. Now it's becoming a reality. Scientists are working with systems like the one below and even starting to commandeer planetariums to "Do Research". I wanna be a cosmologist when I grow up.

Mobile Phones and QR / Domino TagsFrom Adaptive Path

While there are HUGE issues capturing data off of dense domino tags, it's gonna be cool when someone figures it out...in the meantime, I'd suggest looking at an established standard,like say UPC codes.